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<Head>
<Title>plus&lt;T&gt;</Title>
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<H1>plus&lt;T&gt;</H1>

<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "functors.gif" Alt=""   WIDTH = "194"  HEIGHT = "38" ></TD>
<TD Align=right><Img src = "type.gif" Alt=""   WIDTH = "194"  HEIGHT = "39" ></TD>
</TR>
<TR>
<TD Align=left VAlign=top><b>Category</b>: functors</TD>
<TD Align=right VAlign=top><b>Component type</b>: type</TD>
</TR>
</Table>

<h3>Description</h3>
<tt>Plus&lt;T&gt;</tt> is a <A href="functors.html">function object</A>.  Specifically, it is an 
<A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>.  If <tt>f</tt> is an object of class
<tt>plus&lt;T&gt;</tt> and <tt>x</tt> and <tt>y</tt> are objects of class <tt>T</tt>, then
<tt>f(x,y)</tt> returns <tt>x+y</tt>.
<h3>Example</h3>
Each element in <tt>V3</tt> will be the sum of the corresponding elements
in <tt>V1</tt> and <tt>V2</tt>
<pre>
const int N = 1000;
<A href="Vector.html">vector</A>&lt;double&gt; V1(N);
<A href="Vector.html">vector</A>&lt;double&gt; V2(N);
<A href="Vector.html">vector</A>&lt;double&gt; V3(N);

<A href="iota.html">iota</A>(V1.begin(), V1.end(), 1);
<A href="fill.html">fill</A>(V2.begin(), V2.end(), 75);

assert(V2.size() &gt;= V1.size() &amp;&amp; V3.size() &gt;= V1.size());
<A href="transform.html">transform</A>(V1.begin(), V1.end(), V2.begin(), V3.begin(),
          plus&lt;double&gt;());
</pre>
<h3>Definition</h3>
Defined in the standard header <A href="functional">functional</A>, and in the nonstandard
backward-compatibility header <A href="function.h">function.h</A>.
<h3>Template parameters</h3>
<Table border>
<TR>
<TH>
Parameter
</TH>
<TH>
Description
</TH>
<TH>
Default
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>T</tt>
</TD>
<TD VAlign=top>
The function object's argument type and result type.
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</tr>
</table>
<h3>Model of</h3>
<A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>, <A href="DefaultConstructible.html">Default Constructible</A>
<h3>Type requirements</h3>
<tt>T</tt> must be a numeric type; if <tt>x</tt> and <tt>y</tt> are objects of type <tt>T</tt>,
then <tt>x+y</tt> must be defined and must have a return type that is
convertible to <tt>T</tt>.  <tt>T</tt> must be <A href="Assignable.html">Assignable</A>.
<h3>Public base classes</h3>
<tt><A href="binary_function.html">binary_function</A>&lt;T, T, T&gt;</tt>
<h3>Members</h3>
<Table border>
<TR>
<TH>
Member
</TH>
<TH>
Where defined
</TH>
<TH>
Description
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>first_argument_type</tt>
</TD>
<TD VAlign=top>
 <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>
</TD>
<TD VAlign=top>
The type of the first argument: <tt>T</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>second_argument_type</tt>
</TD>
<TD VAlign=top>
 <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>
</TD>
<TD VAlign=top>
The type of the second argument: <tt>T</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>result_type</tt>
</TD>
<TD VAlign=top>
 <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>
</TD>
<TD VAlign=top>
The type of the result: <tt>T</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>T operator()(const T&amp; x, const T&amp; y)</tt>
</TD>
<TD VAlign=top>
 <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>
</TD>
<TD VAlign=top>
Function call operator.  The return value is <tt>x + y</tt>.
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>plus()</tt>
</TD>
<TD VAlign=top>
 <A href="DefaultConstructible.html">Default Constructible</A>
</TD>
<TD VAlign=top>
The default constructor.
</TD>
</tr>
</table>
<h3>New members</h3>
All of <tt>plus</tt>'s members are defined in the
<A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A> 
and <A href="DefaultConstructible.html">Default Constructible</A>
requirements. <tt>Plus</tt> does not introduce any new members.
<h3>Notes</h3>
<h3>See also</h3>
The <A href="functors.html">Function Object</A> overview, 
<A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>,
<tt><A href="binary_function.html">binary_function</A></tt>, 
<tt><A href="minus.html">minus</A></tt>, 
<tt><A href="times.html">multiplies</A></tt>,
<tt><A href="divides.html">divides</A></tt>, 
<tt><A href="modulus.html">modulus</A></tt>, 
<tt><A href="negate.html">negate</A></tt>

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